A vector of strings

[amphetaman@gmail.com]

Hello. I am writing code to put the traditional C-style command-line
arguments into a std::vector of std::strings. I was wondering: which
is the best way to do it? Are they identical?

#include <string>
#include <vector>

int mymain(const std::vector<std ::string&);

int main(int argc, char *argv[])
{
std::vector<std ::stringtheArgv ;
for (int i = 0; i < argc; i++)
{
// a) or b) ?
}
return mymain(theArgv) ;
}

a) theArgv.push_ba ck(argv[i]);

b) theArgv.push_ba ck(std::string( argv[i]));

Any help is appreciated. :)

[Kai-Uwe Bux]

Re: A vector of strings

amphetaman@gmai l.com wrote:

Hello. I am writing code to put the traditional C-style command-line
arguments into a std::vector of std::strings. I was wondering: which
is the best way to do it? Are they identical?
>
#include <string>
#include <vector>
>
int mymain(const std::vector<std ::string&);
>
int main(int argc, char *argv[])
{
std::vector<std ::stringtheArgv ;
for (int i = 0; i < argc; i++)
{
// a) or b) ?
}
return mymain(theArgv) ;
}
>
a) theArgv.push_ba ck(argv[i]);
>
b) theArgv.push_ba ck(std::string( argv[i]));
>
Any help is appreciated. :)

What about

c)

int main ( int argn, char ** args ) {
std::vector< std::string argument ( args, args+argn );



Best

Kai-Uwe Bux

[amphetaman@gmail.com]

Re: A vector of strings

std::vector< std::string argument ( args, args+argn );

Could you please explain that line in detail? I don't seem to
understand what it does.

[Kai-Uwe Bux]

Re: A vector of strings

amphetaman@gmai l.com wrote:

> std::vector< std::string argument ( args, args+argn );

>
Could you please explain that line in detail? I don't seem to
understand what it does.

std::vector<Tha s a constructor

template < Iterator >
vector ( Iterator from, Iterator to );

This constructor will construct a vector of Ts from any range whose elements
are convertible to T. Since char* converts to std::string, you can
construct a vector of strings from any range of char* Now, args is a
pointer to an array of char*, therefore

[args, args+argn)

is a range of char*.


Best

Kai-Uwe Bux